<\/p>\n

To calculate the resistance when powering a LED use this:<\/p>\n

R=(Vpow-Vled)\/I<\/strong><\/span><\/p>\n

\n
• R: <\/strong>is the needed resistance<\/li>\n
• Vpow: <\/strong>is the voltage of our source or power supply (e.g. battery)<\/li>\n
• Vled: <\/strong>voltage of the LED<\/li>\n
• I<\/strong>: the maximum of current that goes through our LED.<\/li>\n<\/ul>\n

  for a 2V (diode forward voltage) LED we need 20mA =0.02A (diode forward current)<\/p>\n

  So, for instance, if we have a 12V battery then: R=(12-2)\/0,02= 10\/0.02=500 Ohm<\/p>\n

  Another example is the use of multiple LEDs in an array. So, for an array of 4 LEDs with diode forward voltage 2V, diode forward current (0.02mA) and a Vpow of 12V we need:<\/p>\n

  \n

  4 x 1 array uses 4 LEDs exactly<\/p>\n\n\n\n

  +12V<\/td>\n

  \n\n\n\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n R\u00a0=\u00a0220000\u00a0ohms<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \n each 220000 ohm resistor dissipates 0.088 mW<\/li>\n the wizard says the color code for 220000 is red red yellow<\/li>\n the wizard thinks 1\/4W resistors are fine for your application<\/li>\n together, all resistors dissipate 0.088 mW<\/li>\n together, the diodes dissipate 0.16 mW<\/li>\n total power dissipated by the array is 0.248 mW<\/li>\n the array draws current of 0.02 mA from the source.<\/li>\n<\/ul>\n Here is a calculator to automatically find your needed resistance [>><\/a>].<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"   To calculate the resistance when powering a LED use this: R=(Vpow-Vled)\/I R: is the needed resistance Vpow: is the voltage of our source or power supply (e.g. battery) Vled: voltage of the LED I: the maximum of current that goes through our LED. for a 2V (diode forward voltage) LED we need 20mA =0.02A (diode forward current) So, for instance, if we have a 12V battery then: R=(12-2)\/0,02= 10\/0.02=500 Ohm Another example is the use of multiple LEDs in an array. So, for an array of 4 LEDs with diode forward voltage 2V, diode forward current (0.02mA) and a Vpow of 12V we need: 4 x 1 array uses 4 LEDs exactly +12V R\u00a0=\u00a0220000\u00a0ohms each 220000 ohm resistor dissipates 0.088 mW the wizard says the color code for 220000 is red red yellow the wizard thinks 1\/4W resistors are fine for your application together, all resistors dissipate 0.088 mW […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":[],"rop_publish_now_history":[],"rop_publish_now_status":"pending","ngg_post_thumbnail":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[649,4],"tags":[],"class_list":["post-4071","post","type-post","status-publish","format-standard","hentry","category-electronics","category-technology"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\t